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    <title>Document</title>
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    <canvas id="canvas">current stock price: $3.15 +0.15</canvas>
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  <script>
    // 获取元素
    const canvas = document.getElementById("canvas");
    // 获取上下文 相当于画笔 CanvasRenderingContext2D
    const ctx = canvas.getContext("2d");
    // 属性
    ctx.fillStyle = "green";
    // 方法
    ctx.fillRect(10, 10, 150, 100);
  </script>
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